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Author Topic: Question: Speaker Ohm Ratings  (Read 1282 times)

Paul M.Sanders

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Question: Speaker Ohm Ratings
« on: February 05, 2007, 09:28:40 am »

Hi all,

Sorry if this seems like a silly question. I THINK I know the answers, but I want to make sure because I'm basing some configuration and possible purchases on it.

I'm driving two Yamaha daisey chained BR12M's on each channel of a Crest VS900 which is rated at 250w into 8 ohms stereo, 450w into 4 ohms stereo.

I believe the situation is that by chaining two speakers, the amps sees 4 ohms. Am I right?

Assuming so, does that mean then the two wedges are dividing up the 450watts between them, meaning each speaker is effectively being driven by 225watts?

Again, if I'm right, would I experience substantial improvement in clarity and projection by feeding these speakers their rated 300 watts?

Thanks,

Paul
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Duane Massey

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Re: Question: Speaker Ohm Ratings
« Reply #1 on: February 05, 2007, 09:58:12 am »

Paul, you've got the idea right, but rather than using the term "daisy-chaining", use the term "parallel". You would probably not notice much difference increasing the available power by 50 watts, as you generally have to double the power for a 3db increase in volume.
If you are clipping the amp, and it's not loud enough, a larger amp would give you more headroom, but it's probably time for a step up in monitors and/or power amp(s).
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Mike McNany

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Re: Question: Speaker Ohm Ratings
« Reply #2 on: February 05, 2007, 10:08:46 am »

Paul M.Sanders wrote on Mon, 05 February 2007 09:28


I believe the situation is that by chaining two speakers, the amps sees 4 ohms. Am I right?

Yes.

Paul M.Sanders wrote on Mon, 05 February 2007 09:28


Assuming so, does that mean then the two wedges are dividing up the 450watts between them, meaning each speaker is effectively being driven by 225watts?

Yes.

Paul M.Sanders wrote on Mon, 05 February 2007 09:28


Again, if I'm right, would I experience substantial improvement in clarity and projection by feeding these speakers their rated 300 watts?

Without really doing the math, that's about a .6 to .7 dB increase, 225 watts to 300. Not noticeable as an increase in SPL, but you may notice more clarity. IOW, if you had the amp to swap around, go for it, but it's not likely worth a major purchase. A specific example I remember clearly making a big difference, by directly swapping an available amp for more power, with a noticable increase in clarity at the same system SPL was with some old Peavety SP2s, jumping from 235 watts (Samson S700) to 450 watts (QSC RMX2450) per speaker. I included the specific amps since some may think the design & company rating methods differing might be part of the improvement. These SP2s were 150/300/600 watt cont/prog/peak rated. They were much cleaner sounding even with running the system at low levels.

Paul M.Sanders wrote on Mon, 05 February 2007 09:28


Thanks,

Paul

You're welcome,

Mike McNany
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